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Zinc
Dry bean varieties exhibit differential response to zinc fertility. The problem is most common in soils where calcareous subsoil has been mixed with surface soils and where high rates of phosphorus were used on the previous crop. Fertilizer containing 3 to 6 pounds of zinc in inorganic form (zinc sulfate) or zinc chelates applied at 0.4 to 0.8 pounds of zinc per acre should be used in areas where the soil tests show low soil zinc levels.
Where zinc deficiency symptoms occur after emergence, the problem can be corrected by foliar application of zinc as early as possible. Good results have been achieved in North Dakota by application of 0.2 pounds of zinc per acre as a foliar spray. Early season detection and treatment are essential for satisfactory results.
Foliar applications after growth stage R1 (Blossoming) seldom increase yield.
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